2 Chronicles 3:4

3:4 The porch in front of the main hall was 30 feet long, corresponding to the width of the temple, and its height was 30 feet. He plated the inside with pure gold.

2 Chronicles 3:8

3:8 He made the most holy place; its length was 30 feet, corresponding to the width of the temple, and its width 30 feet. He plated it with 600 talents of fine gold.